WO2013070431A2 - Procédé et système d'itinérance dans un réseau poste à poste parmi des sites radio comprenant des stations répéteurs de base à canal de repos dynamique - Google Patents

Procédé et système d'itinérance dans un réseau poste à poste parmi des sites radio comprenant des stations répéteurs de base à canal de repos dynamique Download PDF

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Publication number
WO2013070431A2
WO2013070431A2 PCT/US2012/061618 US2012061618W WO2013070431A2 WO 2013070431 A2 WO2013070431 A2 WO 2013070431A2 US 2012061618 W US2012061618 W US 2012061618W WO 2013070431 A2 WO2013070431 A2 WO 2013070431A2
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WO
WIPO (PCT)
Prior art keywords
site
beacon
repeater
network location
rest channel
Prior art date
Application number
PCT/US2012/061618
Other languages
English (en)
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WO2013070431A4 (fr
WO2013070431A3 (fr
Inventor
Satyanarayan R. Panpaliya
Dipendra M. Chowdhary
Hesham H. NAIM
Shiying NING
Teik Choon TEH
Guo-jin WEI
Original Assignee
Motorola Solutions, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Solutions, Inc. filed Critical Motorola Solutions, Inc.
Priority to CN201280055513.1A priority Critical patent/CN104115548B/zh
Priority to DE112012004685.4T priority patent/DE112012004685B4/de
Priority to GB1408260.6A priority patent/GB2510518B/en
Publication of WO2013070431A2 publication Critical patent/WO2013070431A2/fr
Publication of WO2013070431A3 publication Critical patent/WO2013070431A3/fr
Publication of WO2013070431A4 publication Critical patent/WO2013070431A4/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present disclosure relates generally to wireless communication systems and more particularly to roaming between radio sites in a peer to peer network of radio sites having dynamic rest-channel base repeater stations.
  • a wide area network is a network which covers more than one single geographical area, and uses communications circuits and systems to connect a plurality of network nodes.
  • "Wide area" coverage is defined by a number of base repeater stations which are typically distributed geographically over an area, perhaps in a partially overlapping manner, and are connected over a wired or wireless network. Often these stations are distributed in such a way that no one station could cover the same geographic area by itself (however this isn't always the reason for such a wide area network).
  • a local area network may be used to interconnect a plurality of locally-arranged base repeater stations configured so as to provide fully or partially overlapping coverage areas within a contiguous geographic region.
  • Wireless WANs/LANs may utilize communication technologies such as WIMAX (Worldwide Interoperability for Microwave Access), UMTS (Universal Mobile Telecommunications Service), GPRS (General Packet Radio Service), CDMA (Code Division Multiple Access), GSM (Global System for Mobile communications), CDPD (Cellular Digital Packet Data), HSDPA (High-Speed Downlink Packet Access), 3G (third generation), 4G (fourth generation), and the like, to transfer data.
  • Wired WANs/LANs may utilize Data Over Cable Service Interface Specifications
  • DOCSIS Digital subscriber line
  • DSL Digital subscriber line
  • Canopy Ethernet, Tl, or the like to transfer data.
  • a variety of communication scenarios can co-exist.
  • a group call i.e. one subscriber station transmitting to many subscriber stations who are listening, perhaps some of which may be distributed across the network of radio sites.
  • IP Internet Protocol
  • One typical way of providing group communications amongst subscriber stations is to implement a trunked radio communications system.
  • subscriber stations use a pool of channels that are assigned on an as-needed basis for new talkgroup calls. Thus, all talkgroups are served by all channels.
  • the trunked radio system takes advantage of the probability that not all talkgroups need a channel for communication at the same time. Estimates are made about how much load a typical user presents to the system in terms of calls per hour and duration of each call. For a traffic load, fewer channels are required since all talkgroups are served by all channels. Combining this with the number of users on the system, and the acceptable quality of service (QoS), determines how many trunked channels are required to satisfactorily serve the number of users. With a given number of channels, a much greater number of talkgroups can be
  • a primary purpose of a trunked radio system is the efficient utilization of channels allowing for more users to carry many conversations over a fewer number of distinct channels.
  • a trunked radio system can be either a centralized trunked radio system or a decentralized trunked radio system.
  • a centralized trunked radio system uses a dedicated or exclusive controller that assigns traffic channels upon request. Other terms that sometimes refer to the central controller include trunking controller, site controller, resource allocator, channel allocator, controller, and other like terms.
  • the subscriber stations constantly monitor a control channel for channel assignment instructions from the central controller. In order to start a group call, a subscriber station requests that a channel be allocated for its use, and the central controller transmits instructions telling the subscriber stations in the group to switch to a traffic channel assigned for that call.
  • a decentralized trunked radio system does not require the use of an exclusive controller.
  • the intelligence or control function for assignment of a channel to a call is distributed amongst base repeater stations and/or subscriber stations in the wireless communications network.
  • one of the base repeater stations out of the plurality of base repeater stations may be designated a rest channel repeater, and all subscriber stations will idle on the channel (e.g., the rest channel) assigned to the rest channel repeater (the rest channel) and monitor the rest channel for new calls. Requests to start a new call will be received by the rest channel repeater and assigned a traffic channel.
  • the particular repeater designated as a rest channel repeater may change from time to time, perhaps due to detected interference and/or start-up rest channel arbitration procedures between repeaters at a radio site.
  • a new call request received at a rest channel repeater will be assigned to the current rest channel as the traffic channel for the new call.
  • those subscriber stations not participating in the new call instead of those subscriber stations not participating in the new call remaining on the rest channel, those subscriber stations not participating in the new call move to a new rest channel while those subscriber stations wishing to participate in the new call remain on the old rest channel (which has now become a traffic channel for the new call).
  • the new rest channel may be assigned and / or detected in a number of different ways.
  • the rest channel at a decentralized trunked radio system may change over time, it becomes difficult for a subscriber station roaming between geographic areas covered by varying base repeater stations to discover what channel any one particular base repeater station is currently using as a rest channel (e.g., the only channel that is continuously or periodically keyed-on by the repeater) and thus becomes difficult for the subscriber station to sample signal strengths of neighboring coverage areas. Because the subscriber station must search for a current rest channel at each potential neighboring site, the amount of time it takes for the subscriber station to determine if it would be advantageous to hand-off service increases, and the chance that the subscriber station misses a call announcement in its current
  • FIG. 1 is a block diagram of an example of multiple decentralized trunked radio sites having dynamic rest channels connected via a wide area network in accordance with some embodiments.
  • FIG. 2 is an example functional block diagram of a base repeater station operating within the network of FIG. 1 in accordance with some embodiments.
  • FIG. 3 is an example functional block diagram of a subscriber station operating within the network of FIG. 1 in accordance with some embodiments.
  • FIGs. 4a through 4d illustrate various decentralized trunked channel assignment operations that may be used at the decentralized trunked radio sites of FIG. 1 in accordance with some embodiments.
  • FIG. 5 is a diagram illustrating overlapping geographic coverage areas among which a subscriber station may roam in accordance with some embodiments.
  • FIG. 6 is a diagram illustrating one example of staggered inter-beacon and intra-beacon broadcasts of the overlapping geographic coverage areas of FIG. 5 in accordance with some embodiments.
  • FIG. 7 illustrates one example of an inter-site roaming beacon frame structure in accordance with some embodiments.
  • FIG. 8 is a flow diagram illustrating one example of steps executed at a base repeater station in accordance with some embodiments.
  • FIG. 9 is a flow diagram illustrating one example of steps executed at a subscriber station in accordance with some embodiments.
  • the present invention provides for the interconnection of multiple
  • Each radio site operates as a peer within a peer to peer (P2P) topology where the "Peers" talk directly without go-betweens or other centralized and/or intervening control structures or entities.
  • Peer-to-peer is a communications model in which each party has the same capabilities and either party can initiate a communication session.
  • the present disclosure provides for a method and system for efficiently roaming between peer to peer interconnected networks of base repeater stations at decentralized trunked communication sites having dynamic rest channels.
  • FIG. 1 is a block diagram of an example interconnected network system of decentralized trunked radio sites 100, each radio site having a dynamic rest channel in accordance with embodiments of the present disclosure.
  • the system 100 includes a plurality of decentralized trunked radio sites 105-n, each associated with a different (but perhaps overlapping) geographic coverage area.
  • an Internet Modem (IM) 130-n operatively couples each radio site 105-n to a WAN/LAN 135, which in one embodiment, may be the Internet.
  • the IM 130-n may use a standard interface to an Internet provider (i.e. Data Over Cable Service Interface Specifications (DOCSIS), Digital subscriber line (DSL), Canopy, and the like).
  • DOCSIS Data Over Cable Service Interface Specifications
  • DSL Digital subscriber line
  • Canopy and the like.
  • the radio sites 105-n can be connected to one another through Tl 's or other types of WANs or LANs, or multiple interconnected WANs or LANs, in place of or in addition to the WAN/LAN 135.
  • a plurality of base repeater stations BR11 110-1 through BR14 110-4 are located at the first radio site 105-1, a plurality of base repeater stations BR21 111-1 through BR24 111-4 are located at the second radio site 105-2, and a plurality of base repeater stations BR31 112-1 through BR34 112-4 are located at the third radio site 105-3.
  • Each base repeater station 110-n through 112-n may be a base repeater station that is a mobile or fixed (non-mobile), full-duplex or half-duplex, radio frequency (RF) (wireless) modem that transmits and receives control and media
  • RF radio frequency
  • a channel in a frequency division multiple access (FDMA) system comprises a frequency
  • a channel in a time division multiple access (TDMA) system comprises a frequency and a timeslot
  • a channel in a code division multiple access (CDMA) system comprises a frequency and a code.
  • Each of the base repeater stations 110-n through 112-n at a particular radio site are interconnected via one or more wired or wireless connections, and are capable of sharing control and/or media information with one another.
  • Each of the base repeater stations 110-n through 112-n at a particular radio site can receive control and/or media from the WAN/LAN 135 and repeat the information via a corresponding channel of the base repeater station, and can similarly receive control and/or media from a subscriber station and forward the information to other radio sites 105-n via WAN/LAN 135.
  • a Firewall/NAT/Router (FRN) 125-n is an internet protocol (IP) network device which has combined firewall/NAT/router functionality, optionally located at each network location 105-n.
  • IP internet protocol
  • FR 1 125-1 is located at the network location 105-1
  • FRN2 125-2 is located at the network location 105-2
  • FRN3 125- 3 is located at the network location 105-3.
  • one or more base repeater stations interfaces with the respective FRN device 125-n either directly or indirectly.
  • the FRN 125 serves to provide a means of protection for the associated base repeater stations that are accessible via WAN/LAN 135 (including, in one embodiment, the Public Internet).
  • a system topology where the units are connected over Tl 's or other types of WANs or LANs may not require FRNs 125.
  • the FRNs 125 can complicate LAN -wide or WAN-wide group call functionality. For example, firewalls and many NATs don't allow unsolicited packets to be received from other hosts, computers, devices, etc. via a WAN such as the Internet.
  • each radio site 105-n may include more or less than the four base repeater stations illustrated in an exemplary manner in FIG. 1. Other changes are possible as well.
  • each radio site 105-n one or more subscriber stations 141-n can communicate through the respective base repeater stations to other subscriber stations within the system 100.
  • subscriber stations 141-1 and 141-2 are located within radio site 105-1
  • subscriber station 141-3 is located within radio site 105-2
  • subscriber station 141-4 is located within radio site 105-3.
  • FIG. 2 is an example functional block diagram of a base repeater station BR11 110-1 operating within the system 100 of FIG. 1 in accordance with some
  • base repeater stations BR12 110-2 through BR34 112-4 may contain same or similar structures.
  • base repeater station BR11 110-1 includes a communications unit 202 coupled to a common data and address bus 217 of a processing unit 203.
  • the base repeater station BR11 110-1 may also include an input unit (e.g., keypad, pointing device, etc.) 206 and a display screen 205, each coupled to be in communication with the processing unit 203.
  • the processing unit 203 may also include an encoder/decoder 211 with an associated code Read Only Memory (ROM) 212 for storing data for encoding and decoding voice, data, control, or other signals that may be transmitted or received between other base repeater stations or subscriber stations in the same radio site 105-1 as base repeater station BR11 110-1, or perhaps between other base repeater stations in a remote radio site such as radio site 105-2.
  • the processing unit 203 may further include a microprocessor 213 coupled, by the common data and address bus 217, to the encoder/decoder 211, a character ROM 214, a Random Access Memory (RAM) 204, and a static memory 216.
  • RAM Random Access Memory
  • the communications unit 202 may include one or more wired or wireless input/output (I/O) interfaces 209 that are configurable to communicate with subscriber stations such as subscriber station 141-1, with other local base repeater stations such as base repeater station BR12 110-2, and with other remote base repeater stations such as base repeater station BR21 111-1.
  • I/O input/output
  • the communications unit 202 may include one or more wireless transceivers 208, such as a Digital Mobile Radio (DMR) transceiver, a European Terrestrial Trunked Radio (TETRA) transceiver, a P25 or APCO-25 transceiver, a Bluetooth transceiver, a Wi-Fi transceiver perhaps operating in accordance with an IEEE 802.1 1 standard (e.g., 802.1 la, 802.1 lb, 802.1 lg), a WiMAX transceiver perhaps operating in accordance with an IEEE 802.16 standard, and/or other similar type of wireless transceiver configurable to communicate via a wireless network.
  • DMR Digital Mobile Radio
  • TETRA European Terrestrial Trunked Radio
  • the communications unit 202 may additionally include one or more wireline transceivers 208, such as an Ethernet transceiver, a Universal Serial Bus (USB) transceiver, or similar transceiver configurable to communicate via a twisted pair wire, a coaxial cable, a fiber-optic link or a similar physical connection to a wireline network.
  • the transceiver 208 is also coupled to a combined modulator/demodulator 210 that is coupled to the encoder/decoder 211.
  • the microprocessor 213 has ports for coupling to the input unit 206 and to the display screen 205.
  • the character ROM 214 stores code for decoding or encoding data such as control channel messages and/or data or voice messages that may be transmitted or received by the base repeater station BR11 110-1.
  • Static memory 216 may store operating code for the microprocessor 213 that generates inter-site roaming beacons (IRBs) and intra-site beacons (IBs), determines a timing for broadcasting the IRBs and IBs, and causes the IRBs and IBs to be broadcast at the determined timing.
  • IRBs inter-site roaming beacons
  • IBs intra-site beacons
  • static memory 216 may store operating code that, when executed by the microprocessor 213, perform the base repeater station methods and steps disclosed herein.
  • operating code stored in the static memory 216 may, when executed by
  • microprocessor 213, cause the base repeater station BR11 110-1, at least temporarily acting as the rest channel repeater at the first network location, to (i) determine a first timing at which to broadcast the IB and a second timing at which to broadcast the IRB, the IB including at least a rest channel identifier indicating a current rest channel at the first network location and the IRB including at least remote rest channel repeater information identifying a second repeater at a second network location that is currently acting as a rest channel repeater at the second network location,
  • Static memory 216 may additionally or alternatively store operating code that performs some or all of the functions of the one of the base repeater stations described with respect to FIG.s 4-8.
  • Static memory 216 may comprise, for example, a hard-disk drive (HDD), an optical disk drives such as a compact disk (CD) drive or digital versatile disk (DVD) drive, a solid state drive (SSD), a tape drive, a flash memory drive, or a tape drive, to name a few.
  • FIG. 3 is an example functional block diagram of a subscriber station 141-1 operating within the system 100 of FIG. 1 in accordance with some embodiments.
  • Other subscriber stations 141-2 through 141-4 may contain same or similar structures.
  • subscriber station 141-1 includes a communications unit 302 coupled to a common data and address bus 317 of a processing unit 303.
  • the subscriber station 141-1 may also include an input unit (e.g., keypad, pointing device, etc.) 306 and a display screen 305, each coupled to be in communication with the processing unit 303.
  • an input unit e.g., keypad, pointing device, etc.
  • the processing unit 303 may also include an encoder/decoder 311 with an associated code Read Only Memory (ROM) 312 for storing data for encoding and decoding voice, data, control, or other signals that may be transmitted or received between other base repeater stations or subscriber stations in the same radio site 105-1 as subscriber station 141-1, or perhaps between other base repeater stations or subscriber stations in a remote radio site such as radio site 105-2.
  • the processing unit 303 may further include a microprocessor 313 coupled, by the common data and address bus 317, to the encoder/decoder 31 1, a character ROM 314, a Random Access Memory (RAM) 304, and a static memory 316.
  • the communications unit 302 may include one wireless radio frequency (RF) interfaces 309 that are configurable to communicate with other subscriber stations such as subscriber station 141-2 and with base repeater stations such as base repeater station BR11 110-1.
  • the communications unit 302 may include one or more wireless transceivers 308, such as a Digital Mobile Radio (DMR) transceiver, a European Terrestrial Trunked Radio (TETRA) transceiver, a P25 or APCO-25 transceiver, a Bluetooth transceiver, a Wi-Fi transceiver perhaps operating in accordance with an IEEE 802.11 standard (e.g., 802.1 la, 802.1 lb, 802.1 lg), a WiMAX transceiver perhaps operating in accordance with an IEEE 802.16 standard, and/or other similar type of wireless transceiver configurable to communicate via a wireless network.
  • the transceiver 308 is also coupled to a combined modulator/demodulator 310 that is coupled to the encoder/decoder 311.
  • the microprocessor 313 has ports for coupling to the input unit 306 and to the display screen 305.
  • the character ROM 314 stores code for decoding or encoding data such as control channel messages and/or data or voice messages that may be transmitted or received by the subscriber station 141-1.
  • Static memory 316 may store operating code for the microprocessor 313 that receives and decodes IRBs and IBs, calculates an expected timing at which IRBs and/or IBs can be detected at
  • neighboring radio sites based on the decoded IRB, and tunes to the IRBs and/or IBs at the neighboring coverage areas, perhaps to measure a signal strength of the neighboring coverage areas as part of a hand-off determination process.
  • static memory 316 may store operating code that, when executed by the microprocessor 313, perform the subscriber station methods and steps disclosed herein.
  • operating code stored in the static memory 316 may, when executed by
  • microprocessor 313, cause the subscriber station 141-1, to (i) detect a broadcast IB at the radio site 105-1 identifying a current rest channel associated with a base repeater station (e.g., base repeater station BR11 110-1) currently acting as the rest channel repeater at the first network location 105-1, (ii) idle on the identified rest channel and subsequently receive an IRB identifying a second base repeater station (e.g., BR21 111-1) at a second network location (e.g., radio site 105-2) that is currently acting as a rest channel repeater at the second network location, (iii) calculate an expected timing of when one of a second IRB and a second IB is expected to be broadcast by the second repeater at the second network location, and (iv) tune to a rest channel associated with the second repeater at the calculated expected timing.
  • a base repeater station e.g., base repeater station BR11 110-1
  • BR21 111-1 e.g.,
  • Static memory 316 may store further operating code that, when executed by the microprocessor 313, causes the subscriber station 141-1 to measure a signal strength of the IB and/or IRB received on the rest channel associated with the second repeater and determine whether to hand-off service to the second repeater at the neighboring radio site based on the measurement.
  • Static memory 216 may additionally or alternatively store operating code that performs all of the functions of the one of the subscriber stations described with respect to FIG.s 4-7 and 9.
  • Static memory 316 may comprise, for example, a hard- disk drive (HDD), an optical disk drives such as a compact disk (CD) drive or digital versatile disk (DVD) drive, a solid state drive (SSD), a tape drive, a flash memory drive, or a tape drive, to name a few.
  • HDD hard- disk drive
  • CD compact disk
  • DVD digital versatile disk
  • SSD solid state drive
  • tape drive a tape drive
  • flash memory drive or a tape drive
  • FIGs. 4a-4d provide examples of a decentralized trunked radio channel switching that may be implemented at radio sites 105-n. Two examples will be described with respect to FIGs. 4a-4d, including a first example in which subscriber stations idling on an initial designated rest channel are assigned a new traffic channel for a new group call while remaining subscriber stations stay on the initial designated rest channel, and a second example in which subscriber stations idling on an initial designated rest channel remain on the initial designated rest channel (which is converted to a traffic channel for the new group call) while remaining subscriber stations move to a new designated rest channel different from the initial designated rest channel.
  • an initial configuration of a decentralized trunked radio site 400 may include three channels CHI 402, CH2 404, and CH3 406. Each of the channels CH1-CH3 may correspond to a separate base repeater station. Also included in decentralized trunked radio site 400 is subscriber stations (SUs) SU1 410 - SU9 426. Initially, it is assumed that CHI 402 is designated the rest channel (e.g., the channel on which idle subscriber stations are to tune to for new group call information, and which may be identified by a unique synchronization pattern detectable by the SUs). CHI 402 may be designated as a hardcoded default rest channel for
  • decentralized trunked radio site 400 may be elected as an initial rest channel for decentralized trunked radio site 400 via some arbitration procedure between base repeater stations corresponding to channels CH1-CH3, or may be set via some other manner.
  • CH2 or CH3 could be elected as the initial rest channel for decentralized trunked radio site 400.
  • all SUs SU1 410 - SU9 426 initially detect channel CHI as the rest channel and idle on rest channel CHI .
  • SU6 420 transmits a new call request on rest channel CHI 402.
  • the base repeater station corresponding to rest channel CHI 402 may receive the new call request, determine that CH2 404 is idle and available to handle the new call, and assign the new group call to CH2 404.
  • An announcement is then made on CHI 402 instructing all subscriber stations interested in participating in the new group call to move to the newly assigned traffic channel CH2 404. As shown in FIG.
  • SUs SU6 420 -SU9 426 have moved to the new traffic channel CH2 404 to participate in the new call. Meanwhile, SUs SU1 410 - SU5 418, which are not participating in the new call, remain on the initial rest channel CHI 402.
  • SU4 416 transmits a second new call request on rest channel CHI 402.
  • the base repeater station corresponding to rest channel CHI 402 may receive the new call request, determine that CH2 404 is busy but that CH3 406 is idle and available to handle the second new call, and assign the second new call to CH3 406.
  • An announcement is then made on CHI 402 instructing all subscriber stations interested in participating in the second new call to move to the newly assigned traffic channel CH3 406.
  • SUs SU4 416 -SU5 418 have moved to the new traffic channel CH3 406 to participate in the new call.
  • SUs SU1 410 - SU3 414 which are not participating in the second new call, remain on the initial rest channel CHI 402.
  • a decentralized trunked radio site 400 includes three channels CHI 402, CH2 404, and CH3 406. Initially, it is assumed that CHI 402 is designated the current rest channel. CHI 402 may be designated as a hardcoded default rest channel for decentralized trunked radio site 400, may be elected as an initial rest channel for decentralized trunked radio site 400 via some arbitration procedure between base repeater stations corresponding to channels CH1-CH3, or may be set via some other manner. In other embodiments, CH2 or CH3 could be elected as the rest channel for decentralized trunked radio site 400.
  • all SUs SU1 410 - SU9 426 initially detect rest channel CHI and idle on rest channel CHI .
  • the rest channel CHI is automatically assigned as the traffic channel for the new group call.
  • Those subscriber stations wishing to participate in the new group call remain on the rest channel (e.g., now a traffic channel for the new call), and the remaining subscriber stations search out a new rest channel, are instructed by the base repeater station corresponding to channel CHI 402 what the new rest channel will be, or perform some other action to determine where to locate the new rest channel.
  • FIG. 4a all SUs SU1 410 - SU9 426 initially detect rest channel CHI and idle on rest channel CHI .
  • the rest channel CHI is automatically assigned as the traffic channel for the new group call.
  • SUs SU1 410 - SU5 418 which are participating in the new group call, remain on the designated rest channel CHI 402 (e.g., now a traffic channel).
  • SUs SU6 420 -SU9 426 meanwhile, have moved to a new rest channel CH2 404 to listen for subsequent new group call notifications.
  • SUs SU6 420 - SU7 422, which are participating in the second new group call remain on the current rest channel CH2 404 (e.g., now the second traffic channel).
  • SUs SU8 424 - SU9 426 meanwhile, have moved to a new rest channel (in this example, channel CH3 406) to listen for subsequent new group call notifications.
  • FIGs. 5-9 illustrate several examples of how decentralized trunked radio sites with dynamic rest channels can aid subscriber stations in determining whether to hand-off in a more efficient manner, and how subscriber stations utilize the aid provided.
  • FIG. 5 describes an embodiment in which radio sites 105-1 through 105-2 provide an overlapping service area 500 through which a subscriber station such as subscriber station 141-1 may roam.
  • FIG. 6 describes an example staggered IB/IRB broadcast interval between neighboring radio sites that may be utilized in accordance with an embodiment.
  • FIG. 7 describes steps which may be executed at a base repeater station in accordance with some embodiments.
  • FIG. 8 sets forth an example IRB frame structure in accordance with an embodiment.
  • FIG. 9 describes steps which may be executed at a subscriber station in accordance with some embodiments.
  • FIG. 5 sets forth an example in which radio sites 105-1 through 105-3 provide an overlapping service area 500 through which a subscriber station 141-1 may roam.
  • BRl 1 110-1 is currently acting as the rest channel repeater at radio site 105-1 and provides a coverage area 502 corresponding to a radio transmission distance 50
  • BR22 111-2 is currently acting as the rest channel repeater at radio site 105-2 and provides a coverage area 510 corresponding to a radio transmission distance 512
  • BR33 112-3 is currently acting as the rest channel repeater at radio site 105-3 and provides a coverage area 520 corresponding to a radio transmission distance 522.
  • coverage areas 502, 512, and 522 are illustrated as generally circular-shaped coverage areas for ease of illustration, in practice, coverage areas 502, 512, and 522 will have irregular shapes dependent upon the topography of the surrounding land and the presence of structures such as tall buildings. Furthermore, while only three coverage areas are shown in FIG. 5, more or fewer coverage areas could also be used. Furthermore, the coverage areas 502, 512, and 522 could overlap in different ways than that illustrated in FIG. 5, and in at least one example, one coverage area out of coverage areas 502, 512, and 522 could entirely overlap another coverage area.
  • a subscriber station 141-1 is currently operating within each of the coverage areas 502, 512, and 522. Although subscriber station 141-1 is capable of receiving service from any one of base repeater stations BRl 1 110-1 (associated with coverage area 502 and radio site 105-1), BR22 111-2 (associated with coverage area 510 and radio site 105-2), and BR33 112-3 (associated with coverage area 520 and radio site 105-3), subscriber station 141-1 will generally only be actively receiving service from a selected one of base repeater stations BRl 1 110-1, BR22 111-2, and BR33 112-3.
  • subscriber station 141-1 is initially idling on a rest channel 506 associated with BRl 1 110-1 (e.g., BRl 1 110-1 is currently acting as the rest channel repeater for radio site 110-1) and monitoring the rest channel 506 for new call notifications with which it is associated (and, in one embodiment, for new call notifications that it is not associated so that it may locate a new rest channel associated with radio site 105-1 when the old rest channel is assigned as a traffic channel for the new call).
  • radio site 105-1 may be considered to be subscriber station's 141-1 "home site.”
  • the subscriber station 141-1 is currently located near an edge of the coverage area 502 associated with radio site 105-1. Accordingly, it would be advantageous for subscribe station 141-1 to begin or continue sampling signals associated with neighboring radio sites (e.g., radio sites 105-2 and 105-3) to determine if neighboring radio sites 105-2 and 105-3 currently, or in the future, can provide a higher signal strength and/or signal quality compared to that provided by radio site 105-1.
  • neighboring radio sites e.g., radio sites 105-2 and 105-3
  • radio sites 105-2 and 105-3 operate using a dynamically assigned rest channel (e.g., the only channel that is continuously or periodically keyed-up by a radio site and available for signal strength measurements)
  • subscriber station 141-1 must determine what channel is currently being used as the rest channel at each of the neighboring radio sites 105-2 and 105-3 before it can measure a signal strength on the respective rest channels.
  • the current rest channel for radio site 105-2 is rest channel 516 associated with base repeater station BR22 11 1-1
  • the current rest channel for radio site 105-3 is rest channel 526 associated with base repeater station BR33 112-3.
  • subscriber station 141-1 would have to stop monitoring rest channel 506 of radio site 110-1 for a period of time while it scans all possible frequencies, codes, and/or time slots used by rest channels 516 and 526, hoping to tune to the respective rest channel at the right time to catch a transmission (such as a beacon) so that it can measure a signal strength.
  • a transmission such as a beacon
  • FIG. 6 sets forth an example staggered beacon transmission structure in which a new beacon called an inter-site roaming beacon (IRB) is transmitted by each radio site on an intermittent or periodic basis, in addition to the pre-existing intra-site beacon (IB).
  • IB inter-site roaming beacon
  • a base station repeater e.g., BRl 1 110-1) at a first radio site (e.g., radio site 105-1) broadcasts an IB at a first beacon interval 602 on a current rest channel 506
  • a base station repeater e.g., BR22 111-2
  • a second radio site e.g., radio site 105-2
  • a base station repeater e.g., BR33 112-3) at a third radio site (e.g., radio site 105-3) broadcasts an IB at a third beacon interval 606 on a current rest channel 526.
  • a base station repeater e.g., BRl 1 110-1
  • a base station repeater e.g., BR22 111-2
  • a second radio site e.g., radio site 105-2
  • the first through third beacon intervals are the same, and each is offset (e.g., staggered) with respect to at least one other beacon interval.
  • staggering the beacon intervals in this manner, it makes it easier for a mobile station at one radio site (e.g., the first radio site) to refrain from monitoring the current rest channel 506 at the first radio site and sample a signal strength of a beacon broadcast at another radio site (e.g., the second radio site).
  • the mobile station 141-1 could sample the signal strength at the second radio site without missing any beacons on the current rest channel 506 of the first radio site.
  • FIG. 6 a first IB 612 is shown broadcast at the first site, followed
  • the first IB 612 is a traditional intra-site status message carrying information for subscriber stations within the coverage area of the base repeater station BRl 1 110-1, including, for example, identifying a current rest channel, identifying channels with ongoing group calls, and identifying group IDs associated with the ongoing group calls, among other information.
  • the first IRB is an additional beacon frame that is used to identify current rest channels at radio sites other than the home site (e.g., sites other than the first radio site 105-1, which in this example includes second radio site 105-2 and third radio site 105-3).
  • FIG. 7 illustrates a detailed example of an IRB frame structure 700.
  • the IRB frame structure 700 comprises 12 bytes of information, including a first two bytes 702 that contain propriety information and identify the frame as an IRB.
  • the first two fields 704, 706 of the third byte allow for chaining of messages if more than one frame is required for a particular IRB (e.g., perhaps in situations where more than 6 Site IDs are required) and provide for a faster method of identifying TDMA timeslots in which an IRB may be transmitted.
  • the third field 708 of the third byte identifies the current rest channel (e.g., rest channel 506 at radio site 105-1 in this example).
  • the Async field 710 bit is set to 1 to indicate that the IRB is asynchronous (i.e., the IRB is not transmitted at regular intervals), whereas the Async field 710 bit is set to 0 to indicate that the IRB is periodic (i.e., it is transmitted at a scheduled regular interval).
  • the "My Site Id" field 712 of the fourth byte identifies an assigned site ID for the current radio site (e.g., radio site 105-1).
  • the site ID contained in the My Site Id field 712 may be used by a subscriber station in calculating an expected timing of one or more IBs or IRBs in a neighboring radio site, as will be discussed in more detail with respect to FIG. 9.
  • the "# of Nbr Sites Listed" field 714 lists the number of neighbor sites listed in bytes 5-10 of the IRB frame 700. While the particular IRB frame 700 illustrated in FIG. 7 supports a maximum of 6 neighbor radio sites, in other possible frame structures, more or less than 6 neighbor radio sites can be included.
  • Fields 716, 720, 724, 728, 732, and 736 set forth site ID's for neighbor sites of the home site that is broadcasting the IBR, and fields 718, 722, 726, 730, 734, and 738 set forth a current rest channel of the sites identified in the corresponding fields 716, 720, 724, 728, 732, and 736.
  • the site IDs provided to radio sites are consecutively numbered and provisioned upon installation. Of course, other methods of provisioning site IDs could be used as well, and other types of IRB frame structure could be used.
  • a second IB 616 is shown broadcast at the second site 105-2, followed immediately thereafter by a second IRB 618.
  • a third IB 620 is shown broadcast at the third site 105-3, followed immediately thereafter by a third IRB 622.
  • the beacon duration 613 of each IB may be, for example 240 ms or more, and the beacon duration 615 of each IRB may be, for example, 60 ms or more.
  • the time duration ⁇ 626 between broadcasts of neighboring radio site IRBs may be, for example 660 ms or more. While the time duration ⁇ 626 between broadcasts of neighboring radio site IRBs may not vary between radio sites, in some embodiments, it may vary.
  • beacon duration 613 of each IB and the beacon duration 615 of each IRB may not vary between radio sites, in some embodiments, one or both may vary.
  • the IRBs 614, 618, and 622 are illustrated as following immediately after the broadcast of the respective IBs 612, 616, and 620, in other embodiments, the IRBs 614, 618, and 622 may immediately precede the respective IBs 612, 616, and 620, or may be broadcast at some time offset from the beginning or ending of the respective IBs 612, 616, and 620. Other possibilities exist as well.
  • the IRB broadcast intervals provide for an ideal time or times for a subscriber station 141-1 to tune away from its home radio site and sample signal strengths in one or more neighboring radio sites. While IB 620 is illustrated as being broadcast at a same time as another IB 625 in order to increase the frequency of IB's at radio sites 105-1 through 105-3, in another embodiment, the beacon intervals 602-606 could be extended to prevent overlapping IB broadcasts.
  • the IRBs may not broadcast every time an IB is broadcast. Instead, the IRBs may be broadcast at some multiple of the IB broadcast period, for example, from 2-10 times the IB broadcast interval.
  • the IRB broadcast interval 628 is set to five times the IB broadcast interval, in order to reduce the amount of transmit time and power consumption, but still provide updated dynamic rest channel information for neighboring sites. There is, of course, a tradeoff then between the frequency of transmitting IRBs, and the chance that a rest channel has changed at a site in between broadcasts of the IRB.
  • an IRB may be broadcast every time an IB is broadcast.
  • FIG. 8 sets forth a flow diagram of steps 800 that may be executed at a base repeater station to provide the staggered IB/IRB beacons set forth in FIG. 6.
  • a base repeater station determines a content and timing of its IB.
  • the content of the IB may include an identification of a current rest channel in the radio site, an identification of channels with ongoing group calls, and an identification of group IDs associated with the ongoing group calls. This information may be updated on an ongoing basis, as the current rest channel changes, new group calls are started, and/or existing group calls are ended.
  • the timing of the IB may be pre-provisioned at the base repeater upon installation, or may be based upon an algorithm that varies the timing of the IB based on the radio site ID (e.g., the same radio site ID 712 included in the IRB frame 700).
  • the radio site ID e.g., the same radio site ID 712 included in the IRB frame 700.
  • all odd radio site IDs may be configured to broadcast at a first pre-provisioned timing, and all even radio site IDs configured to broadcast at a second pre-provisioned timing.
  • radio sites may multiply their radio site ID by the beacon interval 602, 604, 606 to determine their beacon start time with reference to a reference point (such as a synchronization signal sent by a particular radio site to all other radio sites).
  • a radio site with a radio site ID of 0 may begin its beacon interval at time 0 from the reference point.
  • a radio site with a radio site ID of 1 may offset the beginning of its beacon interval from the reference point by the beacon interval (1 * beacon interval).
  • a radio site with a radio site ID of 3 may further offset the beginning of its beacon interval from the reference point by 2 times the beacon interval (2 * beacon interval).
  • a modulus function may additionally or alternatively be applied such that some radio sites have a same beacon timing as another radio site. Other ways of determining relative timing are possible as well.
  • the base repeater station determines a content and timing of its IRB.
  • the IRB may include, among other information, information identifying neighboring radio sites, and for each listed neighboring radio site, an identification of a current rest channel at the neighboring radio site.
  • the content of the IRB may be generated and updated on an ongoing basis, based on updates to rest channel information received from other radio sites.
  • the timing of the IRB may be pre-provisioned at the base repeater upon installation, or may be based upon an algorithm that varies the timing of the IRB based on the radio site ID in a manner similar to the IB timing set forth above. For example, to determine an IRB timing, each radio site may simply use a roaming beacon interval multiplication value to determine when to broadcast the IRB relative to the already calculated IB beacon interval. In the example of FIG. 6, the roaming beacon interval multiplication value is 5, and each radio site broadcasts an IRB every 5 th IB broadcast. Other roaming beacon interval multiplication values could also be used, and other methods of determining IRB timing could also be used.
  • each radio site broadcasts its IB at the first timing determined at step 802.
  • each radio site broadcasts its IRB at the second timing determined at step 804.
  • steps 806 and 808 may be repeated by any given radio site at various points in time in accordance with the determined first and second timings.
  • a radio site may receive an updated rest channel information message from another radio site, setting forth either new rest channel information for a new radio site not previously listed in the IRB, or setting forth new rest channel information for a radio site already previously listed in the IRB.
  • the radio site receiving the updated rest channel information updates the content of the IRB to reflect the new radio site and/or new rest channel information, and broadcasts the newly updated IRB at a next broadcast interval in accordance with the second timing.
  • a radio site may receive a new call request from a subscriber station on its rest channel.
  • the radio site e.g., one or more of the base repeater stations at the radio site
  • the radio site may assign the rest channel on which the new call request was received to be the traffic channel for the new call (either explicitly or inherently assigned), designate a new channel for the radio site as the new rest channel for the radio site, modify the IB to reflect the new designated channel as the new rest channel, and transmit a notification to other radio sites setting forth the new rest channel so that other radio sites may update their respective IRBs.
  • FIG. 9 sets forth a flow diagram of steps 900 that may be executed at a subscriber station to receive and process the staggered IB/IRB beacons set forth in FIG. 6, and use received IRB information to more quickly and efficiently measure a signal strength of one or more neighboring dynamic rest-channel radio sites.
  • a subscriber station detects, receives, and decodes an IB from a radio site in which it is currently operating and/or receiving service from.
  • the subscriber station idles on the rest channel indicated by the IB.
  • the subscriber station receives and decodes an IRB from the radio site in which it is currently operating and/or receiving service from.
  • the subscriber station calculates an expected timing of a beacon on a current rest channel of one or more neighboring radio sites based on the information included in the IRB.
  • the subscriber station may execute step 908 (and/or one or more of subsequent steps 910-914) in response to an internally or externally sourced trigger to determine if neighboring radio sites can provide a stronger signal to the subscriber station compared to its current radio site, in response to a loss of signal or increase in interference at its current radio site, or for some other reason.
  • the subscriber station can quickly identify a channel (e.g., the rest channel) at each neighboring radio site that is most likely to have a transmission / broadcast that can be used to measure signal strength. Furthermore, using knowledge of the site ID of its current radio site and the site ID of respective neighboring radio sites as set forth in the IRB, the subscriber station can more easily determine when each neighboring radio site is most likely to have a transmission / broadcast on its rest channel that can be used to measure signal strength. (See, for example, FIG. 7, which includes the My Site ID field 712 and neighboring radio site ID information fields 716-738).
  • a subscriber station can determine an expected timing of a transmission / broadcast of an IB at the particular neighboring radio site in accordance with the following equations:
  • ⁇ is the pre-determined time duration 626 between broadcasts of neighboring radio site IRBs and a is the beacon interval 602, 604, 606.
  • a subscriber station can determine an expected timing of a transmission / broadcast of an IRB at the particular neighboring radio site in accordance with the following equations:
  • ⁇ is the pre-determined time duration 626 between broadcasts of neighboring radio site IRBs
  • a is the beacon interval 602, 604, 606, and Y is the IRB broadcast interval 628 multiplier.
  • a subscriber station can determine a channel on which to measure a signal at the particular neighboring radio site having a dynamic rest channel and determine a best timing at which to measure a signal on the determined channel.
  • the subscriber station tunes to the current rest channel in the particular neighboring radio site in accordance with the calculated expected timing.
  • the subscriber station may then measure a signal strength of a signal associated with an IB and/or IRB received on the current rest channel in the particular neighboring radio site.
  • the subscriber station may determine whether to hand-off service to the neighboring radio site based on a comparison between a signal strength received at the subscriber station's home radio site (e.g., before tuning to the neighboring radio site) and the measured signal strength at the neighboring radio site.
  • the subscriber station may hand-off service to the neighboring radio site if the neighboring radio site can provide a greater signal strength than the subscriber station's home radio site. In another embodiment, the subscriber station may hand-off service to the neighboring radio site if the neighboring radio site can provide a signal strength that is a threshold amount greater than the subscriber station's home radio site. The threshold amount may be, for example, 6 dB or more. Other examples are possible as well. [0087] In some embodiments, steps 912 and 914 may be executed for two or more, or all, neighboring radio sites indicated in the received IRB.
  • the subscriber station may compare only a neighboring radio site having a highest measured signal strength to the subscriber station's home radio site and hand-off service to the neighboring radio site having the highest measured signal strength as long as it is higher (perhaps by a threshold amount) than the subscriber station's current radio site.
  • the subscriber station may compare a signal strength measurement of every one of the neighboring radio sites to the subscriber station's current radio site, and hand-off service to the first neighboring radio site that has a measured signal strength that is a threshold amount higher than the subscriber station's current radio site, or hand-off service to the neighboring radio site that has a highest measured signal strength and that is also a threshold amount higher than the subscriber station's current radio site.
  • a device or structure that is "configured" in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
  • processors or “processing devices”
  • microprocessors digital signal processors, customized processors and field programmable gate arrays (FPGAs) and unique stored program instructions (including both software and firmware) that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions of the method and/or apparatus described herein.
  • FPGAs field programmable gate arrays
  • unique stored program instructions including both software and firmware
  • some or all functions could be implemented by a state machine that has no stored program instructions, or in one or more application specific integrated circuits (ASICs), in which each function or some combinations of certain of the functions are implemented as custom logic.
  • ASICs application specific integrated circuits
  • an embodiment can be implemented as a computer-readable storage medium having computer readable code stored thereon for programming a computer (e.g., comprising a processor) to perform a method as described and claimed herein.
  • Examples of such computer-readable storage mediums include, but are not limited to, a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a ROM (Read Only Memory), a PROM (Programmable Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory) and a Flash memory.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un réseau radio à ressource partagée poste à poste comprenant une pluralité d'emplacements de réseau, chaque emplacement de réseau comprenant une pluralité de répéteurs et un répéteur dynamiquement sélectionné qui joue au moins temporairement le rôle d'un répéteur de canal de repos à chaque emplacement de réseau. Un premier répéteur au niveau du premier emplacement de réseau peut déterminer un premier instant auquel diffuser une balise intra-site et un second instant auquel diffuser une balise d'itinérance inter-site, la balise intra-site comprenant au moins un identificateur de canal de repos indiquant un canal de repos du premier emplacement de réseau et la balise d'itinérance inter-site comprenant au moins des informations de répéteur de canal de repos à distance identifiant un second répéteur, au niveau d'un second emplacement de réseau, qui joue actuellement le rôle d'un répéteur de canal de repos au niveau du second emplacement de réseau. Le premier répéteur peut alors diffuser la balise intra-site au premier instant et la balise d'itinérance inter-site au second instant.
PCT/US2012/061618 2011-11-10 2012-10-24 Procédé et système d'itinérance dans un réseau poste à poste parmi des sites radio comprenant des stations répéteurs de base à canal de repos dynamique WO2013070431A2 (fr)

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CN201280055513.1A CN104115548B (zh) 2011-11-10 2012-10-24 在具有动态休息信道中继器基站的无线电站点之中用于在对等网络中漫游的方法和系统
DE112012004685.4T DE112012004685B4 (de) 2011-11-10 2012-10-24 Verfahren und System für den Rufbereichswechsel in einem Peer-to-Peer-Netzwerk aus Funkstandorten mit auf dynamischen Ruhekanälen basierenden Repeater-Stationen
GB1408260.6A GB2510518B (en) 2011-11-10 2012-10-24 Method and system for roaming in a peer to peer network among radio sites having dynamic rest channel base repeater stations

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US13/293,643 2011-11-10
US13/293,643 US8805273B2 (en) 2011-11-10 2011-11-10 Method and system for roaming in a peer to peer network among radio sites having dynamic rest channel base repeater stations

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EP2932761B1 (fr) 2012-12-14 2019-07-31 Nokia Solutions and Networks Oy Amélioration du temps de transfert
WO2015144075A1 (fr) 2014-03-26 2015-10-01 海能达通信股份有限公司 Méthode de protection contre des anomalies d'un système d'acheminement étendu et station de relais
EP3125585B1 (fr) * 2014-03-26 2019-09-25 Hytera Communications Corporation Limited Station mobile, répéteur et procédés de communication de partage
CN104469694B (zh) * 2014-03-26 2018-09-14 海能达通信股份有限公司 一种基于集群系统的通信方法及装置
CN110351717B (zh) * 2019-07-18 2021-12-07 中国联合网络通信集团有限公司 终端被动加入异网群组的方法及其装置
US10880703B1 (en) * 2019-09-09 2020-12-29 At&T Mobility Ii Llc Facilitation of interconnectivity for mobile devices for 5G or other next generation network
CA3164154A1 (fr) * 2020-01-10 2021-07-15 Michel Veillette Procede et systeme de communication a l'aide d'un canal par defaut pendant des periodes inutilisees d'intervalles de temps

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GB2510518B (en) 2016-08-03
US20130122899A1 (en) 2013-05-16
WO2013070431A4 (fr) 2013-11-07
CN104115548A (zh) 2014-10-22
DE112012004685B4 (de) 2022-06-09
GB201408260D0 (en) 2014-06-25
WO2013070431A3 (fr) 2013-09-12
GB2510518A (en) 2014-08-06
DE112012004685T5 (de) 2014-10-02
US8805273B2 (en) 2014-08-12
CN104115548B (zh) 2018-01-16

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